Add Linuxulator / NVIDIA-autoload fix plan; link from research hub

Diagnoses why NVIDIAGraphics595.kext won't autoload (nvidia.ko MODULE_DEPEND(linux)
unsatisfied) and pkg install claude-code aborts (kern.features.linux64 unset) — both
from NextBSD lacking the Linuxulator (distinct from the baked-in LinuxKPI that makes
i915/drm/wifi work). Verified crux: amd64 name inversion (linux=linux32 i386,
linux64=64-bit); NVIDIA depends on 'linux' never 'linux64'. Recommended split:
disable NV_SUPPORT_LINUX_COMPAT for nvidia autoload (matches i915/drm), bake
linux_common+linux64 into nextbsd-kernel for Linux binaries. From an 8-agent workflow
+ 3 review lenses, on-hardware diagnosis (RTX 3060 Ti 0x2489).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: pkgdemon